Tribological Behavior and Analysis on Surface Roughness of CNC Milled Dual Heat Treated Al6061 Composites

Table 4

(a) Response table for means and signal to noise ratios; (b) regression analysis (ANOVA) by genetic linear model on surface roughness (DF = degree of freedom, SS= sum of squares, MS = mean squares, C= contribution).

Level	Work piece	Tool	Speed	Feed rate
1	1.7898	4.0098	2.2550	2.5200
2	3.0378	0.8177	2.5725	2.3075
Delta	1.2480	3.1920	0.3175	0.2125
Rank	2	1	3	4
Level	Work piece	Tool	Speed	Feed rate
1	−2.362	−11.730	−3.634	−5.711
2	−7.028	2.339	−5.756	−3.680
Delta	4.665	14.069	2.122	2.031
Rank	2	1	3	4
Source	DF	SS	MS	F	P	C (%)
Workpiece	1	3.1150	3.1150	5.73	0.096	12.26
Tool	1	20.3777	20.3777	37.51	0.009	80.18
Speed	1	0.2016	0.2016	0.37	0.585	0.793
Feed rate	1	0.0903	0.0903	0.17	0.711	0.355
Error	3	1.6297	0.5432			6.413
Total	7	25.4144				100
Model summary
S	R-sq	R-sq (adj)	R-sq (pred)
0.737051	93.59%	85.04%	54.40%